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WAEC Mathematics 2005 Question 38

Question 38

Algebraic Expressions

Simplify: 2/(3xy) − 3/(4yz)

  1. A.(2 − x)/(12xyz)
  2. B.(2z − 3x)/(12xyz)
  3. C.(4z − 3x)/(12xyz)
  4. D.(8z − 9x)/(12xyz)
Show the answer and explanation

Answer: D ((8z − 9x)/(12xyz))

Explanation

Over 12xyz: 2 × 4z − 3 × 3x = 8z − 9x.